Question

if n!/(n-1)!=5 ,, then (n-2)! =?
plz do help me ... ... i dont know how to do this question ...

Answer 1

what is n! defined as?

what is (n-1)! defined as?

Answer 2

'expand' the factorials and youll be able to solve for n

Answer 3

if n=5 then,
5!/(5-1)!=5
therefore (5-2)!=3! i.e 3x2x1=6

Answer 4

@cj49 from where 3(2)(1) came ?

Answer 5

the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n.

Answer 6

for eg 5!=5x4x3x2x1=120

Answer 7

ahh :O

Answer 8

can u tell me what is this ! ??

Answer 9

!=factorial

Answer 10

http://www.youtube.com/watch?v=4j66DS_XTSo

Answer 11

\(\Large n! = n\times (n-1)\times (n-2)\times ... \times 3\times 2\times 1\)

example
\(\Large 7! = 7\times6\times5\times4\times3\times2\times1\)

Answer 12

\(\Large n! = n\times [(n-1)\times (n-2)\times ... \times 3\times 2\times 1] \\ \Large = n \times (n-1)!\)

Answer 13

thank u so much @cj49 & @hartnn thsnkx alot for helping me :D

Answer 14

np c:

Answer 15

:)
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